People tend to speak more slowly and put less emphasis in the middle of words when telling a lie.

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How to spot a liar: People tend to speak more slowly and put less emphasis in the middle of words when telling a lie, study finds

  • Researchers have synthesized voices speaking words in different tones and pitches
  • It was to mimic the ‘sound signature’ humans use when lying or being honest
  • They then asked volunteers to listen to sounds and rate the words as honest or dishonest.
  • They found a slower speech and less emphasis was a signature for dishonesty

By Ryan Morrison For Mailonline

Posted: | Updated:

When someone tells a lie, it is possible to surprise them – because they are more likely to speak slowly and put less emphasis in the middle of words, according to a study.

Researchers at the Sorbonne University have conducted a series of experiments aimed at understanding how we decide, based solely on voice, whether a speaker is honest.

They found that there was a signature in a liar’s voice – slower speech and less emphasis on the middle of a word – that the brain can automatically detect – even when not trying. actively determine if someone is being honest or not.

It is hoped that this finding can be used in the future to develop “light tools” that police can use to determine whether a criminal is lying.

Researchers at the Sorbonne University have conducted a series of experiments aimed at understanding how we decide, based solely on voice, whether a speaker is honest. Stock image

Researchers at the Sorbonne University have conducted a series of experiments aimed at understanding how we decide, based solely on voice, whether a speaker is honest. Stock image

PROSODY: THE MELODY OF A WORD

Researchers have found that the prosody of a word can carry a signature that allows people to determine another person’s honesty.

Prosody is about the melody of speech – that is, the pitch, rhythm, and intensity of a spoken word.

Intonation, tone, stress and rhythm are also aspects of the prosody signature.

This may reflect the speaker’s emotional state and any presence of pronounced irony or sarcasm.

A study by French researchers found that the prosody of a lie includes slower speech, less emphasis on the middle of the word, and increasing inflection at the end of the word.

The study authors say that if you want to be seen as honest and confident, speak faster, put more intensity in the middle of a word, and drop the tone at the end.

These subtle changes in the way we speak are registered by the brain “automatically” and occur in a number of languages ​​including English, French and Spanish.

French researchers used speech signal processing to create random pronunciations of words, including pitch rising and falling.

They then asked several groups of volunteers whether the words were spoken with certainty or honestly.

The success of human cooperation depends on mechanisms that allow individuals to detect the unreliability of the people with whom they deal regularly.

Although they are an integral part of human society, researchers are not entirely sure what sensory inputs humans use to determine the trustworthiness of others.

To try to solve this problem, the French researchers used a data-driven method to decode prosodic features that stimulate listeners’ perception of speaker certainty and honesty through pitch duration and volume.

“Here we show that listeners’ perceptions of the certainty and honesty of other speakers from their speech are based on a common prosody signature,” they said.

The study authors say that if you want to be seen as honest and confident, speak faster, put more intensity in the middle of a word, and drop the tone at the end. Stock image

The study authors say that if you want to be seen as honest and confident, speak faster, put more intensity in the middle of a word, and drop the tone at the end. Stock image

Prosody refers to the “melody” of a phrase or word: its pitch, speed, and intensity.

‘We find that these two types of judgments [certainty and honesty] are based on a common prosodic signature that is perceived independently of individuals’ conceptual knowledge and native language, ”the study authors wrote.

“Finally, we show that listeners automatically extract this prosodic signature, and that this impacts the way they memorize the spoken words.

“These findings highlight a unique hearing adaptation that enables human listeners to quickly detect and respond to unreliability during linguistic interactions.

They found that this “intrinsic” ability to detect “signatures” in a voice could be used to determine whether the person is telling the truth or is selling pigs.

“Prosody therefore conveys information about the truth value or certainty of a proposition,” the team wrote.

They are now trying to figure out how speakers produce such prosody based on their intentions – rather than just how people perceive different pronunciations.

The results were published in the journal Nature Communications.

How to tell if someone is lying to you: watch to see if they are imitating your actions

Any poker expert knows the power of “tells” – small actions that indicate that a player is trying to deceive his opponent.

Now, a new study suggests that one of the best ways to tell if someone is lying to you is to see if they are imitating your actions.

Dutch researchers at Erasmus Universiteit Rotterdam have used motion capture to monitor the behavior of liars as they tell increasingly important lies to someone else.

We can mimic the behavior of others unconsciously, and we become more likely to automatically imitate them if the brain is working hard, the researchers explained.

Because it’s harder for the brain to be dishonest than to tell the truth, we tend to imitate our victims when we’re deceitful, they added.



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